TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 3–46 3–3 TROUBLESHOOTING CHART — CONTINUED d. ELEVATING SYSTEM The elevating system consists of a gunner’s selector switch box assembly, assistant gunner’s control assembly, gunner’s control assembly, selector valve assembly, manual elevating hand pump, equilibration manifold assembly, primary accu- mulator, secondary accumulator, locking relief and valve, and the equilibrated elevating cylinder. The gunner’s selector switch box assembly is used to electrically switch between power and manual elevation through the selector valve assembly. The selector valve assembly allows for the powered elevation control from either of gunner’s control assemblies. The gunner’s control assembly, hydraulically operates the equilibrated elevating cylinder through the locking relief and valve. The equilibrated elevating cylinder can also be operated manually using the manual elevating hand pump at the equilibra- tion manifold assembly. Hydraulic pressure is supplied by the primary and secondary accumulators and through the equili- bration lines. SECONDARY ACCUMULATOR PRIMARY ACCUMULATOR EQUILIBRATION MANIFOLD ASSEMBLY MANUAL ELEVATING HAND PUMP SELECTOR VALVE ASSEMBLY LOCKING RELIEF AND VALVE EQUILIBRATED ELEVATING CYLINDER ASSISTANT GUNNER’S CONTROL ASSEMBLY (RIGHT) GUNNER’S CONTROL ASSEMBLY (LEFT) GUNNER’S SELECTOR SWITCH BOX ASSEMBLY POWER PACK ASSEMBLY MAIN ACCUMULATOR POWER RELAY BOX ASSEMBLY SLIP RING ELECTRICAL CONTACT HOLDER OPERATING PRESSURE 900 PSI (6206 kPa) ELEVATING SYSTEM POWER, 900 PSI (6206 kPa) DRAIN RESERVOIR PRESSURE, 0 PSI (0 kPa) PUMP PRESSURE, 925 TO 1225 PSI (6378–8446 kPa) ELECTRICAL CONTROL CIRCUIT EQUILIBRATION LINES